Display screen with a graphical user interface



FIG. 1 is a front view of a display screen with a graphical user interface showing our new design;

FIG. 2 is a second embodiment thereof;

FIG. 3 is a third embodiment thereof; and,

FIG. 4 is a fourth embodiment thereof.

The broken lines showing an electronic device illustrate environmental subject matter, whereas the broken lines showing a display screen and elements of the graphical user interface illustrate portions of the article. The shading or gradient represented by dots illustrates elements of the graphical user interface. No subject matter depicted in either the broken lines or dots form part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 